seems to control module loaded and driver in use, and nothing seems amiss with the system though I'm not sure where to go to troubleshoot. Been searching around the web and found someone had the same error in the Intel forums, also using a NUC. That person didn't get an answer there nor did he say which NUC it was he was using.Any speculation on this?Thanks

Just wanted to add this update, in case anyone finds their way here seeking answers to the same problem. Finally had a little light shed on this, but without solution. At this link, https://communities.intel.com/thread/114759, one person writes

the SMBus interface was removed from the mapping table because, in the Windows environment (where Intel does not provide a driver for general use), there were all sorts of 3rd-party drivers that are screwed up by the interrupt routing. It was easier to remove it from the mapping than to rein in all of these drivers (which mostly seemed to want to use it in polled mode anyway). As you saw in the log, the i801_i2c driver just switched to polled mode and kept on trucking...

More explanation is provided at the link which leads me to believe the case is NUC related and a solution requires modification for both BIOS and i801 driver for anyone up to those tasks.